Unique use of Interface

[mcavignesh]

We have been using interface in many ways. But i still struggle to find out the unique reason of interface. ie. The thing which cannot be done in Java without Interface. One certain example is Multiple Interface cannot be achieved w/o interface. I need some more reasons. If anyone knows please share it.

[softech]

i. Interface in java is used for implemntion the concept of polymerphism i.e a behaviour can behave differently depading upon the requirment. and situation where it is used.
i.e suppose i declared a interface called as calculateArea and in that i am declering a methood named as area. whennever i ll implement that interface as the rule of interface says that i have to provide the implementation for the area methood.
so if i implement that interface in Circle class then i ll provide the implementation for the area methood of interface as to calculate the area of the circle.

[nikkj]

Multiple Inheritance is not directly supported by Java but it can be achieved through Interface and so the unique use of Interface is to support multiple inheritance in Java.

[suresh.sa]

The unique usage of the interface is just to support the multiple inheritance in the java, since java wont support multiple inheritance.

[Ashif Shadab]

Hi, it is rally true but there is one thing which the Interface is mainly boarn is Interface data member is constant.